Sister, that could happen anytime. My daughter has been married almost a year now.

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A couple of years ago, I told my younger sister I was going to be a grandma (I'm too young for that) but anyway, she told me at the same time "it's official, I'm going to be a mother-in-law and a grandma" and she is 3 years younger. And she became a grandma 6 weeks before me